Wave-meter.



R. HIRSGH. WAVE METER.

APPLICATION FILED MAR. 17, 1911. RENEWED JAN. 6, 1913.

Patented June 10, 1913.

This connection may v sliding contacts S S the latter is fixed UNITED STATES PATENT oFFicE.

- i I E mc'n'azan mason, or BERLIN, GnamaNY, -Ass1eno:t 'ro DR...ERICH r. Horn,

" e. m. B. 11., OFBEBLIN, sem nar.

wave-marten Specification of Letters'latent. Patented June 10 1 3- Ap n ationmei March 17, 1911, Serial No. 615,012. Renewed January 6', 1,913. SerialNo. 740547.

No. 25 Nollend orfstrasse, Berlin, Germany,

have invented certain new and useful Im-- provements inWV'ave-Meters, of which the following is a specification.

Wave meters now in use are based upon the principle of resonance. In these meters the amount 'of capacity-of self-induction of an oscillating circuit is varied until an indicator connected in the circuit shows a maximum current or voltage. As the wave length-for each reading of the measuring circuit is known, the wave length of the also determined. Thus in every case, from the search for the pos'i tion of resonance. This invention relates to a Wave meter which is also based on the principle of resonance but in' which a search for the.

resonance position by hand is not necessary, and perm1ts; the direct reading of the -frequency in a high frequency circuit as is the case 1n other instruments such as voltmeters etc. a

The Figures 1 and 2 of the drawing show diagrammatically the arrangement according to the invention. Fig. 3. is another diagram of the Wave meter. circuit.

C C is an adjustable condenser C being stationary and the part 0 on the axis 'adriven by a motor M (Fig. 1).

L is a self-induction, which is also capable of adjustment, and such as a gas tube (as shown in the drawing) or a spark gap, which is connected in parallel with the" self induction or capacity.

the part fected in Fig. 1, for instance, by rotary in connection with the conductors of thegas tube or indicator A; to the rotatable part ofthe condenser and'plays over a scale. B (Fig. 2), otherwise the varying member of the selfinduction should be connected with the indicator A; Of course, the said connection may also be indirect or capacitative.

Eitherthe SBli-iJIdllClllOIl or the capacity, as the case may be, is the means for influencing or determining. the frequency. and this is effected in a varying degree'by the quick revolution of the motor M. Thus it is obvious from Figs. 1 and 20f the drawits range Cfrom the this each time. As

and induction coil Z.

rotatable A a voltage indicator,

be a direct one as efing that owing-to the rotation of G with respect to C,.the' capacity (or otherwise the self-induction) periodically passes through smallest to the highest '-onsequently, the resonance posivalues. tion would be passed during each revolution :and' the voltage indicator would indicate this\ alwayshappens in the same position, the resonance position would be continuously shown by a thin streak of light emitted by the indicator'A. The gas tube moving over the scale B suitably calibrated in wave lengths permits the wave length or frequency to read off directly. In Fig. '3, a general diagram is shown of the connection of the'w'ave meter circuit with the oscillatory circuit composed of an oscillatory a The advantage of this arrangement does not only reside in the direct reading of the wave length, but also in the resultthat thisreading is more accurate than in other known methods.

The constancy of circuits, whose wave length is to be determined, is always subject adjustment of the resonance, the determination always depends on apersonal capacity;

invention, practically affords an automatic I,

or exciti'n'g gap z',-'condenser k ,to a. certain oscillation, and in the manual F indication giving the average value of a large number of readings. position is not affected by variations'in the exciting intensity which only result in a varying degree of brightness of the illumi nated strip or indicatorA. Small variations of wave length are show-n by a widening out of the strip, while the median line of the strip serves as index to be read on the scale, this index, involving the arithmetical -mean of a considerable number of single values with great accuracy. v ,.A further advantage of the invention 'is,

that the width of the illuminated strip and the differences of intensityon 'it are indications for the actual dampingin the primary circuit. The wider the'strip and thelesser the differences of intensity on it, the greater-- the damping. 'L

A further arises, when it is necessary ,'-to" ascertain whether an oscillation circuit contains one or more Waves. .If there are several waves,

The resonance advantage of the invention I the harmonic Oscillations as-well as the fundamental oscillations can be read ofi 'the seen'on the scale, the relationsof which can;

be ascertained by the difference of their luminous 'intensit i Having now particularly described and ascertained the nature otmy saidinvention and in what manner the same is to be performed, I declare that 'whatI claim and wish .to secure by Letters Patent is 1. In a wave meter, the combination with an oscillating circuit variable periodically and continuously in its frequency, of an indicator electrically connected with said oscillating circuit and rotating in the period'of the variatiolrof the frequency, and means upon which indications given by-said indicator may be read, 1

- l. 2; In awave meter,-the' combinatlons with a condenser haYll'lg a rotary member provided with an-indicator, of an inductance electrically connected with said indicatoig means-for rotating the rotary member of the condenser in relation-to the fixed part in presence of two given by said indicator may be read.

3. In a wave meter, the combination with a condenser, including a fixed member and a rotary member provided with an indicator, of a motor upon the shaft of which the rotary condensermember is'carried, an

inductance electrically connected to said indicator, and a suitably calibrated scale upon which the indications cator may be read.

4. In a wave meter, the combination with a condenser having a rotary member provided with an indicator, of a motor upon the shaft of which the rotary condenser member is carried, contact members upon the-motor shaft, an inductance, meansvby which the indicator is connected in parallel through said contact members with the inductance, and a scale upon whichthe' indications given by said indicatorvlnay be read.

In testimony whereof I afiix my signature witnesses. RICHARD HIRSCH. Witnesses:

HENRY HAsPER,

VVOLDE AR HA'UPT.

thereof, and means upon which indications given by said indi- 

